summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
blob: 6bf8730f1a2115068e82b5fdc6c4694d9acdb9fb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
/*
 * Copyright (C) 2014 NVIDIA Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>

#include <video/mipi_display.h>

struct sharp_panel {
	struct drm_panel base;
	/* the datasheet refers to them as DSI-LINK1 and DSI-LINK2 */
	struct mipi_dsi_device *link1;
	struct mipi_dsi_device *link2;

	struct backlight_device *backlight;
	struct regulator *supply;

	bool prepared;
	bool enabled;

	const struct drm_display_mode *mode;
};

static inline struct sharp_panel *to_sharp_panel(struct drm_panel *panel)
{
	return container_of(panel, struct sharp_panel, base);
}

static void sharp_wait_frames(struct sharp_panel *sharp, unsigned int frames)
{
	unsigned int refresh = drm_mode_vrefresh(sharp->mode);

	if (WARN_ON(frames > refresh))
		return;

	msleep(1000 / (refresh / frames));
}

static int sharp_panel_write(struct sharp_panel *sharp, u16 offset, u8 value)
{
	u8 payload[3] = { offset >> 8, offset & 0xff, value };
	struct mipi_dsi_device *dsi = sharp->link1;
	ssize_t err;

	err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
	if (err < 0) {
		dev_err(&dsi->dev, "failed to write %02x to %04x: %zd\n",
			value, offset, err);
		return err;
	}

	err = mipi_dsi_dcs_nop(dsi);
	if (err < 0) {
		dev_err(&dsi->dev, "failed to send DCS nop: %zd\n", err);
		return err;
	}

	usleep_range(10, 20);

	return 0;
}

static __maybe_unused int sharp_panel_read(struct sharp_panel *sharp,
					   u16 offset, u8 *value)
{
	ssize_t err;

	cpu_to_be16s(&offset);

	err = mipi_dsi_generic_read(sharp->link1, &offset, sizeof(offset),
				    value, sizeof(*value));
	if (err < 0)
		dev_err(&sharp->link1->dev, "failed to read from %04x: %zd\n",
			offset, err);

	return err;
}

static int sharp_panel_disable(struct drm_panel *panel)
{
	struct sharp_panel *sharp = to_sharp_panel(panel);

	if (!sharp->enabled)
		return 0;

	backlight_disable(sharp->backlight);

	sharp->enabled = false;

	return 0;
}

static int sharp_panel_unprepare(struct drm_panel *panel)
{
	struct sharp_panel *sharp = to_sharp_panel(panel);
	int err;

	if (!sharp->prepared)
		return 0;

	sharp_wait_frames(sharp, 4);

	err = mipi_dsi_dcs_set_display_off(sharp->link1);
	if (err < 0)
		dev_err(panel->dev, "failed to set display off: %d\n", err);

	err = mipi_dsi_dcs_enter_sleep_mode(sharp->link1);
	if (err < 0)
		dev_err(panel->dev, "failed to enter sleep mode: %d\n", err);

	msleep(120);

	regulator_disable(sharp->supply);

	sharp->prepared = false;

	return 0;
}

static int sharp_setup_symmetrical_split(struct mipi_dsi_device *left,
					 struct mipi_dsi_device *right,
					 const struct drm_display_mode *mode)
{
	int err;

	err = mipi_dsi_dcs_set_column_address(left, 0, mode->hdisplay / 2 - 1);
	if (err < 0) {
		dev_err(&left->dev, "failed to set column address: %d\n", err);
		return err;
	}

	err = mipi_dsi_dcs_set_page_address(left, 0, mode->vdisplay - 1);
	if (err < 0) {
		dev_err(&left->dev, "failed to set page address: %d\n", err);
		return err;
	}

	err = mipi_dsi_dcs_set_column_address(right, mode->hdisplay / 2,
					      mode->hdisplay - 1);
	if (err < 0) {
		dev_err(&right->dev, "failed to set column address: %d\n", err);
		return err;
	}

	err = mipi_dsi_dcs_set_page_address(right, 0, mode->vdisplay - 1);
	if (err < 0) {
		dev_err(&right->dev, "failed to set page address: %d\n", err);
		return err;
	}

	return 0;
}

static int sharp_panel_prepare(struct drm_panel *panel)
{
	struct sharp_panel *sharp = to_sharp_panel(panel);
	u8 format = MIPI_DCS_PIXEL_FMT_24BIT;
	int err;

	if (sharp->prepared)
		return 0;

	err = regulator_enable(sharp->supply);
	if (err < 0)
		return err;

	/*
	 * According to the datasheet, the panel needs around 10 ms to fully
	 * power up. At least another 120 ms is required before exiting sleep
	 * mode to make sure the panel is ready. Throw in another 20 ms for
	 * good measure.
	 */
	msleep(150);

	err = mipi_dsi_dcs_exit_sleep_mode(sharp->link1);
	if (err < 0) {
		dev_err(panel->dev, "failed to exit sleep mode: %d\n", err);
		goto poweroff;
	}

	/*
	 * The MIPI DCS specification mandates this delay only between the
	 * exit_sleep_mode and enter_sleep_mode commands, so it isn't strictly
	 * necessary here.
	 */
	/*
	msleep(120);
	*/

	/* set left-right mode */
	err = sharp_panel_write(sharp, 0x1000, 0x2a);
	if (err < 0) {
		dev_err(panel->dev, "failed to set left-right mode: %d\n", err);
		goto poweroff;
	}

	/* enable command mode */
	err = sharp_panel_write(sharp, 0x1001, 0x01);
	if (err < 0) {
		dev_err(panel->dev, "failed to enable command mode: %d\n", err);
		goto poweroff;
	}

	err = mipi_dsi_dcs_set_pixel_format(sharp->link1, format);
	if (err < 0) {
		dev_err(panel->dev, "failed to set pixel format: %d\n", err);
		goto poweroff;
	}

	/*
	 * TODO: The device supports both left-right and even-odd split
	 * configurations, but this driver currently supports only the left-
	 * right split. To support a different mode a mechanism needs to be
	 * put in place to communicate the configuration back to the DSI host
	 * controller.
	 */
	err = sharp_setup_symmetrical_split(sharp->link1, sharp->link2,
					    sharp->mode);
	if (err < 0) {
		dev_err(panel->dev, "failed to set up symmetrical split: %d\n",
			err);
		goto poweroff;
	}

	err = mipi_dsi_dcs_set_display_on(sharp->link1);
	if (err < 0) {
		dev_err(panel->dev, "failed to set display on: %d\n", err);
		goto poweroff;
	}

	sharp->prepared = true;

	/* wait for 6 frames before continuing */
	sharp_wait_frames(sharp, 6);

	return 0;

poweroff:
	regulator_disable(sharp->supply);
	return err;
}

static int sharp_panel_enable(struct drm_panel *panel)
{
	struct sharp_panel *sharp = to_sharp_panel(panel);

	if (sharp->enabled)
		return 0;

	backlight_enable(sharp->backlight);

	sharp->enabled = true;

	return 0;
}

static const struct drm_display_mode default_mode = {
	.clock = 278000,
	.hdisplay = 2560,
	.hsync_start = 2560 + 128,
	.hsync_end = 2560 + 128 + 64,
	.htotal = 2560 + 128 + 64 + 64,
	.vdisplay = 1600,
	.vsync_start = 1600 + 4,
	.vsync_end = 1600 + 4 + 8,
	.vtotal = 1600 + 4 + 8 + 32,
	.vrefresh = 60,
};

static int sharp_panel_get_modes(struct drm_panel *panel)
{
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(panel->drm, &default_mode);
	if (!mode) {
		dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
			default_mode.hdisplay, default_mode.vdisplay,
			default_mode.vrefresh);
		return -ENOMEM;
	}

	drm_mode_set_name(mode);

	drm_mode_probed_add(panel->connector, mode);

	panel->connector->display_info.width_mm = 217;
	panel->connector->display_info.height_mm = 136;

	return 1;
}

static const struct drm_panel_funcs sharp_panel_funcs = {
	.disable = sharp_panel_disable,
	.unprepare = sharp_panel_unprepare,
	.prepare = sharp_panel_prepare,
	.enable = sharp_panel_enable,
	.get_modes = sharp_panel_get_modes,
};

static const struct of_device_id sharp_of_match[] = {
	{ .compatible = "sharp,lq101r1sx01", },
	{ }
};
MODULE_DEVICE_TABLE(of, sharp_of_match);

static int sharp_panel_add(struct sharp_panel *sharp)
{
	struct device *dev = &sharp->link1->dev;

	sharp->mode = &default_mode;

	sharp->supply = devm_regulator_get(&sharp->link1->dev, "power");
	if (IS_ERR(sharp->supply))
		return PTR_ERR(sharp->supply);

	sharp->backlight = devm_of_find_backlight(dev);

	if (IS_ERR(sharp->backlight))
		return PTR_ERR(sharp->backlight);

	drm_panel_init(&sharp->base);
	sharp->base.funcs = &sharp_panel_funcs;
	sharp->base.dev = &sharp->link1->dev;

	return drm_panel_add(&sharp->base);
}

static void sharp_panel_del(struct sharp_panel *sharp)
{
	if (sharp->base.dev)
		drm_panel_remove(&sharp->base);

	if (sharp->link2)
		put_device(&sharp->link2->dev);
}

static int sharp_panel_probe(struct mipi_dsi_device *dsi)
{
	struct mipi_dsi_device *secondary = NULL;
	struct sharp_panel *sharp;
	struct device_node *np;
	int err;

	dsi->lanes = 4;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->mode_flags = MIPI_DSI_MODE_LPM;

	/* Find DSI-LINK1 */
	np = of_parse_phandle(dsi->dev.of_node, "link2", 0);
	if (np) {
		secondary = of_find_mipi_dsi_device_by_node(np);
		of_node_put(np);

		if (!secondary)
			return -EPROBE_DEFER;
	}

	/* register a panel for only the DSI-LINK1 interface */
	if (secondary) {
		sharp = devm_kzalloc(&dsi->dev, sizeof(*sharp), GFP_KERNEL);
		if (!sharp) {
			put_device(&secondary->dev);
			return -ENOMEM;
		}

		mipi_dsi_set_drvdata(dsi, sharp);

		sharp->link2 = secondary;
		sharp->link1 = dsi;

		err = sharp_panel_add(sharp);
		if (err < 0) {
			put_device(&secondary->dev);
			return err;
		}
	}

	err = mipi_dsi_attach(dsi);
	if (err < 0) {
		if (secondary)
			sharp_panel_del(sharp);

		return err;
	}

	return 0;
}

static int sharp_panel_remove(struct mipi_dsi_device *dsi)
{
	struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi);
	int err;

	/* only detach from host for the DSI-LINK2 interface */
	if (!sharp) {
		mipi_dsi_detach(dsi);
		return 0;
	}

	err = sharp_panel_disable(&sharp->base);
	if (err < 0)
		dev_err(&dsi->dev, "failed to disable panel: %d\n", err);

	err = mipi_dsi_detach(dsi);
	if (err < 0)
		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);

	drm_panel_detach(&sharp->base);
	sharp_panel_del(sharp);

	return 0;
}

static void sharp_panel_shutdown(struct mipi_dsi_device *dsi)
{
	struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi);

	/* nothing to do for DSI-LINK2 */
	if (!sharp)
		return;

	sharp_panel_disable(&sharp->base);
}

static struct mipi_dsi_driver sharp_panel_driver = {
	.driver = {
		.name = "panel-sharp-lq101r1sx01",
		.of_match_table = sharp_of_match,
	},
	.probe = sharp_panel_probe,
	.remove = sharp_panel_remove,
	.shutdown = sharp_panel_shutdown,
};
module_mipi_dsi_driver(sharp_panel_driver);

MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("Sharp LQ101R1SX01 panel driver");
MODULE_LICENSE("GPL v2");